ok so i accedently overrighted some stuff in my lfs folder and now when i try to run the game it just runs the 'Live For Speed DEDI' i dont even know what that is. so i was wondering if i just go download the game again and overright the stuff again will i still be able to have my unlock and all my saves and such?

i would make this, install a new copy of lfs, and pass sets skins, and things you have into the new one, then delete the old one

Assuming you only overwrote the client with the dedi, then yes just popping the client back over the top again should be fine.